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JavaScript (sometimes abbreviated JS) is a programming language that is widely used to give sophisticated functionality to web pages. It is also used occasionally in non-web-related applications—for example in PDF documents, site-specific browsers, and desktop widgets. JavaScript copies many names and naming conventions from the programming language Java, but the two languages are otherwise unrelated and have very different semantics.

JavaScript is a prototype-based scripting language that is dynamic, weakly typed and has first-class functions. It uses syntax influenced by the language C. The key design principles within JavaScript are taken from the Self and Scheme programming languages. It is a multi-paradigm language, supporting object-oriented, imperative, and functional programming styles.

JavaScript was formalized in the ECMAScript language standard and is primarily used in the form of client-side JavaScript, implemented as part of a Web browser in order to create enhanced user interfaces and dynamic websites. This enables programmatic access to computational objects within a host environment. Newer and faster JavaScript VMs and frameworks built upon them (notably Node.js) have also increased the popularity of JavaScript for server-side web applications.